This patch lets GLib's GDesktopAppInfo API watch and notice changes
to the Guix user and system profiles.  That way, the list of available
applications shown by the desktop environment is immediately updated
when the user runs "guix install", "guix remove", or "guix system
reconfigure" (see <https://issues.guix.gnu.org/35594>).

It does so by monitoring /var/guix/profiles (for changes to the system
profile) and /var/guix/profiles/per-user/USER (for changes to the user
profile) and crawling their share/applications sub-directory when
changes happen.

diff --git a/gio/gdesktopappinfo.c b/gio/gdesktopappinfo.c
index f1e2fdd..095c110 100644
--- a/gio/gdesktopappinfo.c
+++ b/gio/gdesktopappinfo.c
@@ -148,6 +148,7 @@ typedef struct
   gchar                      *alternatively_watching;
   gboolean                    is_config;
   gboolean                    is_setup;
+  gchar                      *guix_profile_watch_dir;
   GFileMonitor               *monitor;
   GHashTable                 *app_names;
   GHashTable                 *mime_tweaks;
@@ -180,6 +181,7 @@ desktop_file_dir_unref (DesktopFileDir *dir)
     {
       desktop_file_dir_reset (dir);
       g_free (dir->path);
+      g_free (dir->guix_profile_watch_dir);
       g_free (dir);
     }
 }
@@ -204,6 +206,13 @@ desktop_file_dir_get_alternative_dir (DesktopFileDir *dir)
 {
   gchar *parent;
 
+  /* If DIR is a profile, watch the specified directory--e.g.,
+   * /var/guix/profiles/per-user/$USER/ for the user profile.  Do not watch
+   * ~/.guix-profile or /run/current-system/profile because GFileMonitor does
+   * not pass IN_DONT_FOLLOW and thus cannot notice any change.  */
+  if (dir->guix_profile_watch_dir != NULL)
+    return g_strdup (dir->guix_profile_watch_dir);
+
   /* If the directory itself exists then we need no alternative. */
   if (g_access (dir->path, R_OK | X_OK) == 0)
     return NULL;
@@ -249,11 +258,11 @@ desktop_file_dir_changed (GFileMonitor      *monitor,
    *
    * If this is a notification for a parent directory (because the
    * desktop directory didn't exist) then we shouldn't fire the signal
-   * unless something actually changed.
+   * unless something actually changed or it's in /var/guix/profiles.
    */
   g_mutex_lock (&desktop_file_dir_lock);
 
-  if (dir->alternatively_watching)
+  if (dir->alternatively_watching && dir->guix_profile_watch_dir == NULL)
     {
       gchar *alternative_dir;
 
@@ -1555,6 +1564,32 @@ desktop_file_dirs_lock (void)
       for (i = 0; dirs[i]; i++)
         g_ptr_array_add (desktop_file_dirs, desktop_file_dir_new (dirs[i]));
 
+      {
+        /* Monitor the system and user profile under /var/guix/profiles and
+         * treat modifications to them as if they were modifications to their
+         * /share sub-directory.  */
+        const gchar *user;
+        DesktopFileDir *system_profile_dir, *user_profile_dir;
+
+        system_profile_dir =
+          desktop_file_dir_new ("/var/guix/profiles/system/profile/share");
+        system_profile_dir->guix_profile_watch_dir = g_strdup ("/var/guix/profiles");
+        g_ptr_array_add (desktop_file_dirs, desktop_file_dir_ref (system_profile_dir));
+
+        user = g_get_user_name ();
+        if (user != NULL)
+          {
+            gchar *profile_dir, *user_data_dir;
+
+            profile_dir = g_build_filename ("/var/guix/profiles/per-user", user, NULL);
+            user_data_dir = g_build_filename (profile_dir, "guix-profile", "share", NULL);
+            user_profile_dir = desktop_file_dir_new (user_data_dir);
+            user_profile_dir->guix_profile_watch_dir = profile_dir;
+            g_ptr_array_add (desktop_file_dirs, desktop_file_dir_ref (user_profile_dir));
+            g_free (user_data_dir);
+          }
+      }
+
       /* The list of directories will never change after this, unless
        * g_get_user_config_dir() changes due to %G_TEST_OPTION_ISOLATE_DIRS. */
       desktop_file_dirs_config_dir = user_config_dir;
mission.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: Fix alternate command line invocation (which would not
consider 'manifest.scm').  Use specifications instead of packages.  Remove
perl (now in the guix package's native inputs).  Add b4, git, git:send-email,
mumi, nss-certs, openssl and patman to the manifest.

Change-Id: I49d92dda059856ce217cea9054a466a1754dcf94
Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2024-04-02 23:28:58 +0200'>2024-04-02</span></td><td><a href='/guix/commit/manifest.scm?id=049273bb8c1ea3d6402db646312acdc4abf4678a'>maint: Add perl to the manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: Add perl.

Change-Id: Ie70cea1eb4d62f2a649292209391a92abdae2288
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2024-01-31 09:07:25 +0100'>2024-01-31</span></td><td><a href='/guix/commit/manifest.scm?id=66dd088d3c3404f5cbe2d4d4c5e8f93d184703b0'>maint: Add gnupg to the manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: Add gnupg.

Change-Id: Id5e90f87e5c3a07aa3e49afa97cc0b6d3ce71b41
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-18 22:12:39 +0200'>2023-09-18</span></td><td><a href='/guix/commit/manifest.scm?id=7bf12820f61179900f9d1f753acf91fd33724976'>maint: Support `guix shell' in Guix's git archive with manifest.scm.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
* doc/contributing.texi (Building from Git): Mention using it.
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>